Warp stop motion for looms



March 6, 1928. 1,662,033

J. NORTHROP wARP STOP MOTION FOR LooMs 2 Sheets-Sheet 1 Filed F668, 192763 6" I Marcin 6, 1928.

J. NORTHROP WARP STOP MOTION FOR LOOMS @www Patented Mar.- 6, 1928.

N UNITED STATES 1,662,033 PATENT OFFICE.

JONAS NORTHROP, 0F HOPEDALE, MASSACHUSETTS, ASSIGNOR, BY MESNE ASSIGN-MENTS, TO DRAPER CORPORATION, OF HOPEDALE, MASSACHUSETTS, A CORPORA-TION OF MAINE.

WARP STOP MOTION FOR LOOMS.

Application filed February 8, 1927. Serial No. 166,701.

The present invention relates to an improvement in warp stop motions forlooms.

Upon the breaking of the warp and the falling of a drop wire, the loomis stopped, but it is sometimes a matter of diiiiculty to find the placewhere the break occurred because the upper' end of the fallen drop wireis concealed in the body of the wires and the lower end isnot easilyvisible. The object of the present invention is to produce a warp stopmotion which will not only stop the loom upon the dropping of a wire,but one which will open the warp at the brokcnpoint ready for piecing.To this end the present invention consists in the warp stop motionhereinafter described and particularly defined in the claims. Y

In the accompanying drawings illustrating the preferred form of theinvention,

Fig. 1 is an elevation of a portion of the warp stop motion embodyingthe invention, showing one end of the bank of drop wires; Fig. 2 isasimilar view, showing the parts 1n different position; and Fig. 3 is asectional elevation taken on the line 3--3, Fig. 1.

The illustrated embodiment of the invention isdescribed as follows: Thewarps extend through the eyes of the drop wires 10, which are arrangedin two sets 11 and 12. These drop wires are supported on the drop wirebars 13 and 14, andthe Warps 15 pass through the holes or eyes 16 in thedrop wires. While only two sets of drop wires are shown, the additionaldrop wire bars 17 and 18 are provided so that four sets of drop wiresmay be used if desired. These drop wire bars are carried by heads ateach end of the sets ofwires. In Fig. 1 the head 2O supports these bars.The two heads are held in correct position with relation to each otherby the warp supporting rods 21, 22 and 23, and the frame -bars 24 and25. Below the drop wires are mounted two ladders 26 and 27, the formerof which is a detector slide and the latter of which is a part of theconnection between the detector slide and the knock-off mechanism of theloom. These ladders consist of two side rails connected by rungs 28 and30. rlhe lower ladder 27 normally stands fast, and the upper ladder 26is normally reciprocated. 'These' ladders are supported in guide-ways,one above'the other, in the ladder carriers 31 and 32 on each side ofthe loom. The heads 20, of the stop motion are carried on the usualsupporting bar 33, mounted in the usual manner in the support 34 carriedby the frame 35 of the loom. Pivoted on one of the heads is the pivotshaft 36, and mounted on this pivot shaft is theY bell crank lever 37,of which the depending arm 38 is provided with a slot 40, which engagesa pin 41 carried by the upper ladder 26. The horizontal arm of the bellcrank lever 37 is connected by means of a rod 42` with a vibratingmember operated from some moving part of the loom, which mayconveniently be the weft hammer. Continuously in the operation of theloom the rod-42 is raised and lowered by the operation of the loom,andit oscillates the bell crank lever 37v and therefore reciprocates theupper ladder 26. l

So long as the drop wires are sustained in their upper position by thewarp threads, this reciprocation continues without any effect upon theoperation of the loom. lVhen, however, one of the drop wires ispermitted to fall by the breaking of a warp thread, as, for example, thedrop wire 43,

then it passes between the rungs of the two ladders asl shown-,in Fig.2, andthe movement of the upper ladder to the right causes the wire 43to engage a rung of the lower ladder 27 and thereby move the lowerladder. A second bell crank lever 44, also mounted on the pivot pin 36,has a downwardly hanging arm 45, similar to the downwardly hanging arm38 of the lever 37, which is provided with a slot 46 similar to the slot40, which slot is engaged b the pin 47 secured to the lower ladder 27.he horizontal arm of the bell crank lever 44 .is provided with aprojecting pin 48, which normally engages the bottom of the recess 49formed in the head 50, carried by the arm 51 which is supported upon theshaft 52 and connected with lthe knock-off lever of the loom.

-S'o' long as all the drop wires are held in elevated position, the bellcrank lever 44 is held in the position illustrated in Fig. 1, but when adrop wire falls'then the lever is turned either counter-,clockwise fromthe position shown in Fig. 1 to the position shown in Fig. 2, orclockwise in the o osite direction. The turnin of the bell crank lever44 owing `to the faing of the drop wire operates to swing the arm 51 bypressure of the pin 48 against the walls of the recess 49. Thus,whenever a drop wire falls it stops the loom, and coincidently therewiththe traverse of the ladders causes the fallen drop wire to crowd thewires together, as shown in Fig. 2, and thereby open up the warp andindicate where the broken warp thread is located.

The bell crank lever 37 is provided with a fork 53 having t-wo prongs 54and 55. These prongs project over the horizontal arm of the bell cranklever 44, and the operation is such that when the loomis started upafter having been stopped, as, for example, in the position shown inFig. 2, the lower prong 54, upon the oscillation o'f the bell cranklever 3T, will engage the lower side of the horizontal arm of the bellcrank lever 44 and restore it to its original position, as shown inFig. 1. The rod 52 upon which the swinging arm 5l is mounted, issupported in bearings 56 and 57 of a bracket 58 mounted on a secondbracket 59 carried by the loom frame. The rock shaft 52 is provided withan arm 60, which in normal position, as shown in Fig. 1, rests in theopen recess 61 in the ear 62. Upon the end of the arm 60 is the eye 63of the link 64, which extends downward to and connects with the loomstopping means 65. The eye of the link 64 is held on the arm 60 by thecotter pin 66 on the one side, and the ear 62 on the other.

The head 50 supported on the lower end of the arm 51, is provided withthe recess 49, which is engaged by the pin 48 of the bell crank lever44, and is adjustabl attachedvto the arm by means of the bolt 67, a nut68 being employed to secure the bolt in place. The head is provided onits side with a recess 70, which receives the arm 51, the bolt 67securing the head in proper osition on the arm. The arm isslotted at 1to permit relative movement of the head and arm.

The present inventor is the same Jonas Northrop who is the patenteeofthe warp stop motion illustrated and described in the patent grantedJanuary 13, 1925, No. 1,522,901. In that case a stationary ladder 13 wasemployed, and a reciprocating detector bar 15. The warp'was opened b Ythe engagement of the detector bar with a allen drop wire, which pushedthe drop wires to one side, as shown in Fig. 6. In the presentconstruction two ladders are employed, and one is constantlyreciprocated and the other normally stands fast. When a drop wire fallsthe stationary ladder is moved by the normally moving ladder, and thedrop wires are opened by a movement parallel to themselves, whereas inthe former construction the drop wires were opened by a tippingmovement. In the present construction after the wires are opened theywill stand in open position, whereas in the former patent they tend toreturn to their original closed position by reason of the use of thespring-pressed spreader 16. In the patented construction the spreaderwas located at the center of the loom. Consequently, when a drop wirefell near one side of the warp, a very considerable number of wires weredisplaced, whereas in the resent construction only a few are movedaterally in order to open the warp, and these few rapidly restorethemselves to normal position after the loom is started up again.

One of the good features of the present construction resides in the useof devices for engaging the fallen drop wire in such manner as to moveit parallel to itself in a direction to open the warp. In theillustrated embodiment these comprise the two ladders, one of whichpicks up the other owing to the resistance which the upper end of thedrop wire encounters by being pressed against the adjacent drop wires.Another feature of importance resides in the elimination of toothedbars, which have always vbeen a source of more or less inconvenience indevices of this general character. Another advantage of the constructionflows from the fact that the rungs of the ladders do not greatly impedethe vision so that the fallen drop wire can easily be Seen by theoperative when the warp motion stops the loom. Other features of advantae inherent in the present construction will e obvious to persons skilledin ythe art.

Having thus described the invention, what is claimedis:

1. A warp stop motion for looms having, in combination, a set of dropwires, means for supporting the drop wires, a detector laddermountedbelow the drop wires, between the rungs of which a fallen drop wire isadapted to pass, a trip ladder mounted below the detector ladder, meansfor reciproeatmg the detector ladder loom stopping means, andconnections between the trip ladder and the stopping means actin when adrop wire falls to stop the loom an open the drop Wires.

2. A warp stop motion for looms having, in combination, a set of dropwires, means for supporting the drop'wires, a detector ladder supportedbelow the drop wires, means for continuously reciprocating the detectorladder during the operation of the loom, a trip ladder mounted below thedetector ladder, loom stoppin means, connections between the trip la derand loom stopping means, the detector ladder acting through a fallen drowire to move the trip ladder to stop the oom, and to open the warp bymovement of the adjacent drop wires.

3. A warp stop motion for looms having, in combination, a set of dropwires, normally supported by the warp threads durlll ing weaving, anormally stationary but movable trip device below the drop wires andhaving drop wire engaging portions, a normally reciprocating detectormounted between the drop wires and trip device and having port-ions forengaging a released drop wire, loom stopping means, and connectionsbetween the loom stopping means and the trip device or actuating theformer from the latter through the intervention vof the detector devicepressing against the fallen ldrop wire between the trip device and theset of drop wires.

Il. A warp stop motion for looms having, in combination, a set of dropwires, drop wire bars for supporting the drop wires, heads for carryingthe drop wire bars, a detector ladder mounted below the drop wireshaving rungs adapted to ergage a fallen drop wire, means forreciprocating the detector ladder, a trip ladder located below thedetector ladder and having rungs adapted to be engaged by a fallen dropwire when the latter is pushed against the rung of the trip ladder bythe moving detector ladder rung, stopping means, and connections betweenthe trip ladder *and the stopping means for stopping the loom when adrop wire falls. A

5. A warp stop motion for looms having, iii combination, a set of dropwires, means y for supporting them, a detector ladder having rungssupported below the drop wires, a trip ladder having rungs supportedbelow the detector ladder, means for reciprocating the detector ladder,loom stopping means, and connections between the loom stopping means andthe tripladder, the actuating mechanism for the detector ladder havingprovision for connecting the trip ladder actuating means to restore theladder to normal position on starting up the loom after stopping.

6. A warp stop motion for looms having, in combination, a set of dropwires, means for supporting the drop wires, a detector device locatedbelow the drop wires having portions adapted to engage a allen dropwire, a trip device located below the detector device having portions toengage a crank levers having portions adapted to en- .5.

gage the other bell crank lever to restore the trip device bell cranklever to its normal position after-the loom stopping operation of themotion.

7. A warp stop motion for loomslh'aving, in combination, a set of dropwires normally supported by the warp threads during weavingadetectorladder mounted below the drop wires and between the rungs of which afallen drop wire is adapted to passa trip ladder mounted below the dropywires adjacent the detector ladder, means for reciprocating the detectorladder, loom stopping means, and connections Abetween the trip ladderand the stopping means and operable when a drop wire falls to stop theloom and open the drop wires.

8. A warp stop motion for looms having, in combination, a set of dropwires normally supported by the warp threads during weaving, a detectorbar mounted below the drop wires and provided with portions betweenwhich a fallen drop wire is adapted to pass, a normally stationary tripbar mounted below the rdetector bar and also provided with portionsbetween which a fallen drop wire may pass after it has passed,thedetector bar to thereby lock the detector bar to the trip bar, means forreciprocating the detector bar in a path between the trip bar and dropwires during weaving, loom stopping means, and connections between thetrip bar vand the stopping means and operable when a drop wire fall tostop the loom.

In testimony whereof 'I have signed my name to this specication.

JONAS NoRTHRoP.

